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Radiated emissions in metal box with SMPS's and slack wiring.

treez

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Hi,

We have two offline, isolated, 18W flyback smps’s in a fully enclosed earthed metal enclosure (as attached). One of these flybacks is connected to a cable which leaves the enclosure and goes to a second, open metal enclosure, which contains a 10W Buck converter.

Do you think its possible that radiated emissions from the flyback smps that is NOT connected to the cable, could end up getting on to the cable and radiating off the cable?

Also, both of these flyback SMPS’s also feed there own linear regulator based battery chargers. (batteries are also in the earthed metal enclosure with the flybacks) If the wiring to these batteries is non-twisted pair and just an open loop of some diameter approx. 15cm, then wouldn’t such a loop possibly radiate and result in radiated emissions on the cable that exits the enclosure?

(I am talking 30MHz to 1GHz emissions)
 

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